Please make sure your tort is warm enough, if it is not then it won't eat. These cute creatures are cold-blooded and therefore need quite high temperature.
Torts do not like change. Give your tort time to adapt to a new: place, environment, weather/climate, and so on.
Any pics of your tort's enclosure, lights etc. would enable us to help you more easily.
Thanks! We've had him for about 5-6 months, and this has been for about two weeks. Our apartment is getting colder here as the weather changes, bit the heat lamps are the same. Under his basking lamp it's 88-90 degree